Mukuro and Junko used to be homeless and lived in a very harsh environment as children. It's heavily implied that she was manipulated and verbally abused by Junko.
Mukuro showed a huge interest in the military since childhood. In elementary school, she won a survival game tournament and began writing for military magazines.
Just before entering middle school, Mukuro disappeared while she and her family were on vacation in Europe. People thought she had been kidnapped, but she was never found. In truth, she had decided to join an elite mercenary group based out of the Middle East known as Fenrir, a fierce group of soldiers who engaged in direct combat. Although small for her age, she received military training and became highly proficient in both a variety of firearms and hand-to-hand combat. As a member of Fenrir, she passed through many battlefields but was never wounded.
Three years later, Mukuro returned to Japan to be with her sister. Junko had a strong desire to "paint the world in despair" and planned to start the Tragedy, the worst, most despair-inducing incident in the history of mankind. She called herself and her sister the Despair Sisters AKA the Ultimate Despair.
Mukuro was enrolled in Hope's Peak Academy's Class 78th as the Ultimate Soldier, while her sister was the Ultimate Fashionista.
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Danganronpa Sad Backstories
RandomSome aren't super sad but it tells you their backstory, and yes, these are canon it is not made up
